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/**
 * Copyright 2016 The OpenTracing Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package io.opentracing.impl;

import io.opentracing.Tracer;
import java.util.Map;

import io.opentracing.propagation.Extractor;
import io.opentracing.propagation.TextMap;

final class TextMapExtractorImpl implements Extractor {

    private final AbstractTracer tracer;

    TextMapExtractorImpl(AbstractTracer tracer) {
        this.tracer = tracer;
    }

    @Override
    public Tracer.SpanBuilder extract(TextMap carrier) {

        AbstractSpanBuilder builder = tracer.createSpanBuilder("extracted");
        for (Map.Entry entry : carrier) {
            if (builder.isTraceState(entry.getKey(), entry.getValue())) {
                builder.withStateItem(entry.getKey(), entry.getValue());
            } else {
                builder.withBaggageItem(entry.getKey(), entry.getValue());
            }
        }
        return builder;
    }

}